Lewis & Short

Ădĭăbēna, ae, or Ădĭăbēne, ēs, f., = Ἀδιαβηνή,

  1. I. a region in the northern part of ancient Assyria, now Botan, Plin. 5, 12, 13, § 66; Amm. 23, 6, 20 al.
    Hence,
  2. II. Derivv.
    1. A. Ădĭăbēnus, a, um, adj., pertaining thereto: Monobazus, Tac. A. 15, 14; so ib. 1: regimen, ib. 2. —Ădĭăbēni, ōrum, m., its inhabitants, Plin. 6, 9, 10, § 28.
    2. B. Ădĭăbēnĭcus, a surname of the emperor Severus, as conqueror of Adiabene, Spart. Sev. 9; Sext. Ruf. 21; Inscr. Orell. 903 sq.